Coating apparatus



Sept. 4, 1928.

P. J. BARORD COATING APPARATUS Filed Aug. 26, 1927 W" m messes 1 /404 54Eo/P&,

Patented Sept. 4, 1928.

UNITED STATES 1,682,823 PATENT OFFICE.

PAUL 3'. BAIRORD, OF DORMONT BOROUGH, PEN N BY LVANIA, ABBIGNOB TO m STER- LING VABNISH COMPANY, PENNSYLVANIA.

OF IITTSBUBGH, PENNSYLVANIA, A CORPORATION OI comma nrmmros Application and August 26, 1927. I Serial no. 215,710.

This invention relates to coating apparatus and more particularly to ap aratus for coating pipes, beams, and simi ar objects with paint or other liquid coatin materials.

The present invention app ies to that class of coating apparatus shown and described in my co-pendmg application, Serial No. 131,- 892, filed August 27, 1926, and has for its object the provision of a novel form of battle arrangement for machines of this class whereby the blowin out of the coating fluid by the wi ing flui is entirely eliminated.

In 'the rawin Figure 1 is a longitudinal vertical sectional elevation through the coating chamber of a machine embodying my invention.

Figure 2 is a front elevation of the baflle plate nearest the coatin nozzle.

Figure 3 is a sectiona plan taken on line III-III of Figure 2.

Referring more particularly to the drawings, the numeral 2 designates the coating chamber which is provided at its bottom with a settling basin or tank 3. A pair of end walls 4 extend upwardly from the ends of the basin or tank 3 in spaced relation to the end walls of the coating chamber forming overflow chambers 5 for receiving the coating material overflowing from the settling basin or tank 3.

A pair of branch drain pipes 6 lead from the overflow chambers 5 to a main drain pipe 7, which pipe conducts the fluid back to the source of supply (not shown).

A grate or open support 8 extends longitudinally or from end to end of the coating chamber 2 above the settling basin or tank 3 and overflow chambers 5. Filter screens 9 are supported on the ate or support 8 and the walls 4 above eac of the chambers 5, and cover plates 10 are hingedly supported on the normally overlie t e chambers 5 so as to cause any liquid or coating material descending in the coating chamber to flow into the basin 3 from which it may overflow into the chambers 5 through the screens 9.

A pair of baflle plates 12 and 12 are mounted transversely in the coating cham-.

her 2 in longitudinally spaced relation for a purpose to be described.

An exhaust head 13 communicates through the top of the coatin chamber 2 with the space between the ba e plates 12 and 12.

ate 8 and arranged to The top of the chamber 2 at each side of the exhaust head 13 is closed by hin ed closures 14 so that access may be rearfily had to the interior of the coating chamber 2.

The end walls of the coating chamber are provided with openings 15 through which the work or object to be coated passes. The baflle plates 12 and 12" are also rovided w1th open1ngs 16 and 16, respective y. The openings 15, 16, and 16 are of sufliclent size to permit the largest size object or workpiece to pass.

The openings 15 form nozzle seats in which are seated the nozzles 18 and 19. Different sized nozzles are used. for difi'erent sizes of obJects. However, the bases of all the nozzles are of the same size so as to fit the openings 15. g

The nozzle 18 is adapted to coat the object or workp ece by directing a stream of coatmg materlal thereon and, therefore, is connected through a cored conduit 20 with a coating supply pipe 21.

The nozzle 19 is adapted to direct a stream of air under pressure onto the object or work-place to remove or wipe off all excess coating material and, therefore, is connected through a cored conduit 22 with an air supplyj jplpe 23. i

he numeral 24 desi ates a trip lever adapted to be operated i; the object being coated as it passes through the chamber 2 to control the air supply to the nozzle 19 by means of a valve (not shown).

The bafiie plate 12 extends transversely from. side to side of the chamber 2 and downwardly from the top of the chamber 2 through the grate or en port 8 and an appreciable distance into t e basin 3 so as to extend into the coating liquid in the basin, whereby the lower end of the baflle will be sealed. 1

The baflfle plate 12 as "heretofore stated, 15 provided with an opening 16 throu h which the object being coated passes. T e opening 16 is adapted to be normally closed by a, hinged closure or trap door 25 which is removably hinged to the baflle plate at 25' and is of sufiicient weight'to normally re main closed by gravity. The opening 16 is preferably of suflicient size to permit the passage therethrough of the largest size object for which the machine is designed. In order to more closely approximate the size of the article or object beinggoated, the baflle late12is provided'with guidewa s 26 exten vertically along each side the opening 16, and a stop 27 extending hor1- zontally. below the openin .16, and a ag or reducing plate 28 1s sli ably mounte in the guideways 26. The plate 28 18 provided with a reduced opening 29 closely approximating the size of the object being coated,

: coated.

and difl'erent sizes of the plates 28 are substituted for the diflerent sizes of ob]ects The openin 29 is preferably flared outwardly toward the coating nozzle as at 30, so" as to guide' the object being coated through the opening 29.

plates The baflle plate '12,,which is provided with an opening 16, extends transversely from side to side of the coating chamber 2, andfrom a point shortof the to of the chamber 2 down into the coating iquid in the bas'n 3 .so that the lower end of the baflle is sealed and the upper end is spaced from-thetop wall to form an 0 ning or pway- 31 through which t e air or other wiping fluid discharged by the nozzle .19 may pass into the space between the baflle lates 12 and 12 and escape through the ust head 13. I

In operation, assuming that-the apparatus isequi ped with annular nozzles and baflle having round 0 enings therein for coating ipe, a pipe wi be passed through the n e 18 and its forwar end will pass through the opening .29 in the gag plate 28 and the trap door or closure 25 and force door upwardly. The pipe will or other'fluid against the all excess coating materia then continue its movement through the chamber '2 and throu h the wiping nozzle 19 which nozzle will irect a stream of air 1pipe to wipe off The air discharged by the nozzle 19, which is under high presure, will strike the baflle plate 12 and be directed up over the plate 12 and into the space between theplates 12 and which it will escape through the exhaust head 13'.

.Due to the fact that the 1gag plate 28' has an o n approximatin e size and shape offtEe obg ect or pipe being coated, no appreciable amount of air will escape through plate against'the'passage o zle 18 bythe wiping air from the nozzle 19. While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited thereto since various modifications may be made without de arting from the scope of my invention as efined in the appended claims I claim- 1. 'In an apparatus for coating the surface of an ob ect with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamber, a wiping nozzle at the other end of said chamber, means for supplying coating fluid to said coating nozzle, and means for supplyin gaseous fluid to said wiping nozzle, a b e plate arranged transversely of said coating chamber and adapted to prevent the vpassage of gaseous fluid from said wi ing nozzle'into the path of the coating fluid being dischar from said coating nozzle, said baflle p ate being apertured I to permit the passage of the object to be coated therethrough, and means for normally closin said aperture.

2. 11 an a paratus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamber, a wiping nozzle at the other end of said chamber, means for supplying coating fluid to said coat nozzle, and means for supplyin gaseous uid to said wiping nozzle, a b e plate arranged transversely of said coating chamber and adapted to prevent the passage of gaseous fluid from said wiping nozzle into the path of the coating fluid being discharged from said coating nozzle, said baflie plate being apertured to permit the passage of the object to be coated therethrough, and a yieldable closure for said aperture adapted to normally close said aperture and to be opened by the object being coated as it passes through said aperture.

3. In an'apparatus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamher, a wiping nozzle at the other end of said chamber, means for supplying coating fluid to said coating nozzle, and means for supplying gaseous fluid to said wiping nozzle, a baflle plate arranged transversely of said coating chamber and ada ted to prevent the passage of gaseous fluid from said wiping nozzle into the path of the coating fluid being discharged from said coating nozzle, said baflle plate being apertured to permit the passage of the object to be coated therethough, and a hinged door for said aperture adapted to normally close said aperture and to be opened by the objectbeing coated as it passes through said aperture,

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said door being adapted to close by gravity.

4. In an a paratus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamher, a coating nozzle at one end of said chamber, a wiping nozzle at the other end of said chamber, means for supplying ooating fluid to said coating nozzle, and means for supplying gaseous fluid to said wiping nozzle, a baflie late arranged transversely of said coating c amber and adapted to prevent the passage of gaseous fluid from said wiping nozzle into the path of the coating fluid bein discharged from said coating nozzle, said baffle plate being provided with an aperture of suflicient size to permit the largest sized object to be coated to pass freely therethrough, and a reducing plate having an aperture of less size therein, said plate being removably mounted on said baflle plate so as to partially close the aperture in salt] baflle late.

5. u an a paratus for coating the surface of an ob ect with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamher, a Wiping nozzle at the other end of said chamber, means for supplying coating fluid to said coating nozzle, and means for supplying gaseous fluid to said wiping nozzle, a baflie plate arranged transversely of said coating chamber and adapted to prevent the passage of aseous fluid from said wiping nozzle into t e ath of the coating fluid be in dischar d rom said coating nozzle, said bifile late eing provided with an aperture 0 en objectto be coate to pass freely there through, a reducing plate having an aperture of less size therein, said iplate being removably mounted on said ba e plate so as to partially close the aperture in said battle plate, and a yieldable closure for said aperture in said baflle plate, said closure being adapted to be opened by the ObJect being coated as said object passes through said aperture.

6. In an apparatus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamber, a wi ing nozzle at the other end of said cham er, means for supplying coating fluid to said coating nozzle, and means for supplying gaseous fluid to said wiping nozzle, a baflie plate arranged transversely of said coating chamber and adapted to prevent the passage of gaseou fluid from said wiping nozzle into the path of the coating fluid being discharged from said coating nozzle, said baflie plate being provided with an aperture of suflicient size to permit the largest sized object to be coated to pass freely therethrough, and a reducing plate having an aperture of a size closely approximating the cient size to dpermit the largest sized size of the object being coated, said late being removably mounted on said be e late so as to overlie the aperture in said aflle plate.

7. In an apparatus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber, a coatlng nozzle at one end of said chamber, a wi ing nozzle at the other end of said cham er, means for suppling coating fluid to said coating nozzle, and means for supplying aseous fluid to said wiping nozzle, a afie plate arranged transversely of said coating chamber and adapted to prevent the passage of gaseous fluid from said wi in nozzle into the path of the coating ui being discharged from said coating nozzle, said baflle plate being provided with an aperture of sufiicient size to ermit the largest sized object to be coated to pass freely therethrough, a reducing plate having an aperture of a size closely approximating the size of the object being coated, said plate being removably mounted on said baflle plate so as to overlie the aperture in said baflie plate, and a hinged closure for said aperture in said baflle plate, said closure being adapted to be opened by the object being coated as it passes through said aperture, said closure being adapted to close by gravity.

8. In an apparatus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber, a coating nozzle at one end of said chamber, a wiping nozzle at the other end of said chamber, means for suppling coating fluid to said coating nozzle, and means for suppling gaseous fluid to sa1d wiping nozzle, a baflle plate arranged transversely of said coating chamber and adapted to prevent the passage of gaseous fluid from said wiping nozzle into the ath of the coating fluid being discharged rom said coating nozzle, said baflle plate being provided with an aperture of sufficient size to permit the largest sized object to be coated to pass freely therethrou h, a reducing plate having an aperture 0 a size closely approximating the size of the object being coated, said plate being removably mounted on said baflle plate so as to overlie the aperture in said battle plate, and said aperture in said reducing plate being flared outwardly toward said coating nozzle so as to guide the object to be coated therethrough,

9. In an apparatus for coating the surface of an object with fluid coating material comprising, in combination, a coating chamber aving a settling tank opening into the bottom thereof to receive excess coating material, a coating nozzle at one end of said chamber, a wiping nozzle at the other end of said chamber, means for supplying coating fluid to said coating nozzle, and means for supplying gaseous fluid to said wiping noz z le, a pair of" spaced baflle plates arranged transversely of said chamber,

an exhaust head communicating 'with the. upper end of the space between sald plates, the one of said plates nearest said w tured to permit the passage of the object to be coated therethrough, and means for nor- I signed my name.

mallyelosing said aperture, the other of said baflle plates nearest said wiping nozzle extending. from a point short of the top of said coating chamber down into said settling tank toa point below the level of the coating liquid therein, said last named baflle plate being apertured to permit the p of the ob'ect to be coated therethrough. V

n testimony whereof, I have hereunto PAUL J. BABORD. 

